We do not ignore any PMs or reports. Everything is dealt with one way or another. Just because you do not see the actions taken, does not mean none are taken.
The best thing you can do as you said is block and move on.
If a specific user continues to spam your topics, gather those evidence and forward them to a Trade Mod. Actions will be taken if necessary.
If you need to answer questions regarding your services, it can be done via PM. I believe you've been told before replying to spam is spam as well.
If you have an issues with someone from the Mod Team, you can PM a Senior Mod found here:
https://forums.d2jsp.org/user.php?i=651473